Finding the Fourth Proportional to 21,407.52, 32,112.72 and 8,260

Step by Step Solution

1. Step 1: Write the proportion equation
   21,407.52 : 32,112.72 = 8,260 : x
2. Step 2: Convert to fraction form
   21,407.52/32,112.72 = 8,260/x
3. Step 3: Cross multiply
   21,407.52x = 32,112.72 × 8,260
4. Step 4: Simplify right side
   21,407.52x = 265,251,067.20
5. Step 5: Solve for x
   x = 265,251,067.20/21,407.52
6. Step 6: Final answer
   x = 12,390.56